Telegraph-transmitter.



P. P. DOW.

TELEGRAPH TRANSMITTER.

APPLICATION FILED SEPT. 25, 1911.

v1,059,529., Patented Apr. 22, 1913.

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COLUMBIA PLANOORAPH CO.. WASHINGTON. 13,0.

P. P. DOW. TELEGRAPH TRANSMITTER, APPLIOAYTION FILED SEPT. 25, 1911.

. 1 059 529 Patented Apr. 22, 1913.

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' COLUMBIA PLANOGRAPH c0, WASHINGTON. D. c.

PAUL PEEL DOW, 0F MONTREAL, QUEBEC, CANADA, ASSIGNOR OF ONE-THIRD T0 ALMA BURCHILL MANNING, 0F MONTREAL, QUEBEC, CAN-ADA.

TELEGRAPH-TRANSMITTER.

Specification of Letters Patent.

Patented Apr. 22, 1913.

To all whom it may concern Be it known that I, PAUL PEEL Dow, resident of 2141 St. Urbain street, in the city and district of Montreal, in the Province of Quebec, in the Dominion of Canada, a subject of the King of Great Britain, have invented certain new and useful Improvements in Telegraph-Transmitters; and I do hereby declare that the following is a full, clear, and exact description of the same.

The invention relates to improvements in telegraph transmitters, as described in the present specification and illustrated in the accompanying drawings that form part of the same.

The invention consists essentially in the novel construction and arrangement of parts, whereby means for delivering the impulses representing the dots in a telegraph alphabet is electrically engaged during the period of silence and manually released to effect the dots.

The objects of the invention are to devise a machine which will be very accurate in regard to the performance of the letters de noted by the telegraph alphabet as directed by the operator, to relieve the tensionincidental to an operators labors, to simplify the construction of such devices, particularly in regard to adjustment, and generally to facilitate the transmission of messages by wlre.

In the drawings, Figure 1 is a perspective view of the simple form of the transmitter. Fig. 2 is a diagrammatic view of the form illustrated in Fig. 1. Fig. 3 is a diagrammatic view of the form illustrated in Fig. 1, showing the machine as designed for portable transmitters. Fig. 4 is a diagrammatic view, showing the parts, the wiring and the various connections, as designed for alternative uses, portable and stationary transmitters.

In transmitters for telegraphic purposes, it has, of course, been known to use an arm attracted by an electro-magnet for the purpose of effecting the necessary sounds to rep- 5 arm.

resent the dots in the telegraph alphabet, but in the present description it is intended to describe a novel arrangement of arm magnet and wiring in which the arm, for effecting the dots, is released by the deenergization of the magnet and the necessary impulses made by the vibration of the said Referring to the drawings, 1 is the vibrator arm having the contact 2 at the outer end thereof and the enlarged inner end 3.

4 is a flat spring rigidly secured in the Nil/11161 em; 3 atdpne of its ends and at the 0 ier en ri i su orted at the u er end of the bi ackzt a pp 6 is a weight slidably arranged on the arm 1 and adjustably secured at any part of said arm by the thumb set screw 7, said weight being for the purpose of lengthening or shortening the periods between the vibrations, according to its position on said arm, though it must be understood that this may be accomplished by different arrangement and setting of the spring support at the inner end of said arm, or in fact in any suitable manner, as it is not new to regulate the vibrations of an arm in such a way.

8 is a base supporting the bracket 5 and the other parts to the invention.

9 is a bracket supported on the base 8 at the same end thereof as the contact end 2 of said arm 1.

10 is an electromagnet supported at the upper end of the bracket 9 between said bracket and contact 2, said contact being normally held to said magnet by electromagnetic force.

The arm 1 is formed of electric conducting material and at the inner end 3 has a screw 11 inserted therein holding the U shaped spring contact 12.

13 is a post, mounted on the base 8 adjacent to the inner end 3 of the arm 1.

14 is an adjustable screw contact, inserted through the post 13 into proximity with the spring contact 12, said contact 14 being so adjusted as to meet the spring contact 12 on the vibration of the arm 1, thereby securing impulses for transmission, representing the dots in a telegraph alphabet. It will be thus noticed that as long as the contact 2 is held to the electromagnet 10, the spring contact 12 will be held from any engagement whatsoever with the adjustable contact 14, thereby a period of silence is assured in regard to dots always during the time that the said electromagnet is energized.

15 is a post supported on the base 4, on the opposite side of the arm 1 to the post 13.

16 is an adjust-able screw contact inserted through the post 15 and extending outwardly from one side thereof.

17 is an arm forming part of the key construction and carrying a contact 18 at the outer end thereof coacting with the contact 16, said contacts being separated in denergizing the magnet for the purpose of releasing the contact 2 and allowing the arm 1 to vibrate.

19 is a bracket supporting the arm 17, said arm 17 being secured to said bracket 19 and said base 8 so as to permit it a pivotal movement and said pivotal movement being limited. by the adjusting screws 20 and 21, inserted through the posts 22 and 23 on the opposite side from the contact 16, said screw 20 engaging said arm directly at the limit of the pivotal movement of said arm 17 and forming a stop, and said screw 21 engaging said arm through the helical spring 24, thus holding the contact 18 normally in engagement with the contact 16.

25 is the key proper pivotally secured in the arm 17 by means of the extension 26, said extension 26 being spring-held by the screw 27 and spring 28 into normal close engagement with said arm 17.

29 is a screw contact post, coacting with the contact 30 and the key 25 for effecting the impulses denoting the dashes in a telegraph alphabet. There is no novelty in this part of the'construction as it is common practice in telegraph transmitters to arrange the parts so.

31 and 32 are the binding posts mounted on the base 8 and electrically connected to the line circuit.

33 and 34 are binding posts electrically connected to the local circuit.

35 is a wire electrically connecting the contact 33 through the resistance coil 36 with the electromagnet 10.

37 is a wire electrically connecting the contact 84 through the contacts 18 and 16 with the electro magnet 10, thereby bringing said electromagnet into said local circuit in the normal state of the machine, as the contacts 18 and 16 are normally in engagement, therefore, by swinging the arm 17 on its pivot through the pressure on the key 25, the contacts 18 and 16 are separated, thereby cutting out the electromagnet from the local circuit and thus deenergizing the said magnet for the purpose of permitting the vibration of the arm 1, and the consequent engagement of the spring contact 12 with the adjustable screw contact 14, the vibrations of said arm 1 being sufiicient in any one period to produce the number of dots required, said period of vibration being shortened to reduce the number of dots by the release of pressure on the key.

38 is a wire electrically connecting the contact post 31 through the post 13 and the post 29. to the switch contact 39.

40 is. a wire. electrically connecting the bracket 5 and arm. 1 through the: screw con.-

tact post 32 and switch contact 41 to the bracket 19, therefore, providing an electrical connection to the contact 30' whereby in the engagement of the said contact 30 with the screw contact in the post 29, the line circuit will receive the dashes produced by the engagement of said contacts.

42 is a switch connecting the switch contacts 39 and 41.

In Figs. 3 and 4, practically the same construction is shown, the only difference in Fig. 3 being that an electric battery 43 supplies the place of the local circuit and consequently the electromagnet is wound to correspond in ohms with the strength of the battery, the resistance in this case not generally being considered necessary.

This form of machine is more particu-- larly adaptable as a portable machine for taking to outside places to report games, elections and other events, where it is necessary to have machines away from a central or regular branch oflice.

In Fig. 4, the machine is just simply elaborated, an extra magnet being mounted on the base wound differently from the other magnet so thatin one case the magnet is wound for a local office circuit, while in the other case, fora portable machine, run by a battery, the switch 44 being added to turn on the electricity from the battery and thus make a machine which is adaptable for both portable and stationary purposes.

The operation of this machine has been pretty well indicated herein in the description of the parts, but in order to make it much clearer, it may be explained that the key is pressed to one side in order to accomplish the clashes, bringing the contacts 29 and 30 together. This does not affeet the pivoted arm 17 at all, as the extension 26 is quite free to move without affecting the position of said arm 17, but in order to accomplish the dots, the key is pressed in the" other direction, which brings the said extension against the arm 17, thus moving the arm 17 on its pivot to the full extent of its movement as regulated by the stop screw 20. This regulation is just sufiicient to part the contacts 16 and 18 and in the separation of these contacts, the circuit in which they are included is broken with the ular direction and each of said swings means a dot, therefore, thekey must be released as soon as the necessary number of dots have been transmitted.

Some of the advantages of this construction must be mentioned herein, one of which is the facility with which the key may be operated without tiring the operator. This is particularly noticeable in the fact that the vibrating arm is completely separate from the key arm and that there is nothing whatsoever carried by said key arm, therefore, the weighted arm will be no encumbrance whatsoever to the machine, but on the other hand, greatly enhance the value of it, as the vibrations may be mechanically regulated apart. Then again, the electrical control of the vibrating arm is very important for any mechanical control must be operated by the key in some way or another. The key in this machine is also more readily adjustable as the adjusting parts have nothing whatsoever to do with the mechanism controlling the vibrating arm, in fact, the key construction in this transmitter is nothing more than an arrangement of arms for separating and making contact for the electrical circuits and thus the springs which regulate the lateral movements of the key arms may be adjusted by each operator to his own individual touch, as it is well known that operators have light, heavy and medium touches and consequently wish the transmitter t be adjusted to the particular touch.

What I claim as my invention is:

1. In a telegraph transmitter a tremolant arm supported at one end, an armature carried at the free end thereof, an electro-magnet, an electric contact car ied intermediate of the length of said arm, a line circuit connected with said contact, an electric contact for dots included in said circuit adjacent to the aforesaid contact, means for energizing said magnet, an electric. contact for dashes included in said line circuit and a single key mechanically apart from said tremolant arm and adapted to deenergize said magnet by pressure on one side and to establish electric connection in the llne circuit for dashes by pressure on the other side.

2. In a telegraph transmitter, a tremolant arm, a bracket supporting said arm at one end, an armature on the other end of said arm, a spring electric contact secured to said arm intermediate of the length thereof, a line circuit electrically connected with said arm, an electric contact in said line circuit coacting with said spring contact in making dots, a dash contact in said line circuit, a key electrically connected to said line circuit and having an extension independently operated from the main portion and mechanically apart from said tremolant arm, a local circuit and an electro-magnet therein coacting with said armature in silencing said dot contacts.

3. In a telegraph transmitter, a tremolant arm, a bracket supporting said arm at one end, an armature on the other end of said arm, a spring electric contact secured to said arm intermediate of the length thereof, a line circuit electrically connected with said arm, an electric contact in said line circuit coacting with said spring contact in making dots, a dash contact in said line circuit, a key electrically connected to said line circuit and having an extension independently operated from the main portion and mechanically apart from said tremolant arm, a local circuit and an electro-magnet therein coacting with said armature in silencing said dot contacts and a local circuit contact adapted to be opened by said key extension through a movement of the key in one direction and the main portion of said'key closing said dash contact independent of the extension when moved in the opposite direction.

Signed at the city and district of Montreal, Canada, this thirteenth day of September, 1911.

PAUL PEEL DOW. lVitnesses G. H. Tnnsronnn, H. TAYLOR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

